• Title, Summary, Keyword: Mode Skyhook Control

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Study on the Taxing Mode Control of MR Damper Landing Gear (MR 댐퍼 착륙장치의 택싱모드 제어기법에 대한 연구)

  • Lee, Hyosang;Hwang, Jaihyuk
    • Journal of Aerospace System Engineering
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    • v.13 no.6
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    • pp.43-51
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    • 2019
  • The aircraft vertical acceleration from the excitation of the road surface in the taxing mode is a main factor with a negative effect on the boarding quality of pilots and passengers. In this paper, we propose an appropriate control method to improve the boarding quality of the MR damper landing gear. The proposed control method is Skyhook Control Type 2, which feeds the aircraft vertical acceleration back in addition to the aircraft vertical velocity. Since Skyhook Control Type 2 factors the velocity and acceleration of the upper mass, it can be expected to exceed the control performance of the existing Skyhook Control that factors only the upper mass velocity. For the simulation, the bumper type road surface was selected as a ground surface, and the landing gear model constructed with RecurDyn and the controller designed with Simulink were co-simulated. The control effect of Skyhook Control Type 2 was verified by comparing and analyzing the RMS and maximum value of the upper mass acceleration according to the taxing speed and control method.

Monte Carlo Simulation of MR Damper Landing Gear Taxiing Mode under Nonstationary Random Excitation

  • Lee, Hyo-Sang;Jang, Dae-Sung;Hwang, Jai-Hyuk
    • Journal of Aerospace System Engineering
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    • v.14 no.4
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    • pp.10-17
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    • 2020
  • When an aircraft is taxiing, excitation force is applied according to the shape of the road surface. The sprung mass acceleration caused by the excitation of the road surface negatively affects the feeling of boarding. This paper addresses the verification process of the semi-active control method applied to improve the feeling of boarding. The Magneto-Rheological damper landing gear model is employed alongside the control method. It is a Oleo-Pneumatic damper filled with a fluid having the characteristics of increasing yield stress when subjected to a magnetic field. The control method involves verifying Skyhook Control Type2 developed by Skyhook control. The Sinozuka white noise model that considers runway characteristics was employed for the road surface in the simulation. The runway road surface obtained through this model has stochastic characteristics, so the dynamic characteristics were analyzed by applying Monte-Carlo simulation. A dynamic analysis was conducted by co-simulating the landing gear model made by RecurDyn and the control method designed by Simulink. Simulation results show that the Skyhook Control Type2 method has the best control effect in the low speed range compared to the passive type (without control) and skyhook control.

A Study on The Vibration Reduction of a Driver Seat Controlling an MR Fluid Damper (자기유변유체 댐퍼를 이용한 운전석의 진동감쇠에 대한 연구)

  • 안병일;전도영
    • Journal of Institute of Control, Robotics and Systems
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    • v.8 no.10
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    • pp.861-866
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    • 2002
  • A seat suspension system with a controlled MR(Magneto Rheological) fluid damper is introduced to improve the ride quality and prevent the health risk of a driver compared to fixed seats. The system is located between a seat cushion and the base, and is composed of a spring, MR fluid damper and controller. The MR fluid damper designed in valve mode is capable of producing a wide range of damping force according to applied currents. In experiments, a person was sitting on the controlled seat excited by a hydraulic system The skyhook control, continuous skyhook control and relative displacement control were applied and the continuous skyhook control improved the vibration suppression by 36.6%.

Hybrid Control of Active Suspension System Considering Hydraulic System Dynamics (유압계의 동특성을 고려한 능동 현가계의 합성 제어)

  • 김효준;박혁성;양현석;박영필
    • Journal of KSNVE
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    • v.7 no.2
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    • pp.239-246
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    • 1997
  • This paper presents an active suspension control algorithm to improve the suspension performance trade-offs between riding comfort and handling stability. In this paper, a hybrid control scheme is proposed, the idea of which is that sliding mode control is used for nonlinear hydraulic system and the skyhook control is applied to control the vehicle behavior. The parameter variations in hydraulic system are considered for the robust controller design. The performance of the proposed control method is evaluated by simulation and experiments based on a half car roll model which can reveal both heave and roll behavior.

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A Study on The Vibration Attenuation of a Driver Seat Using an MR fluid Damper

  • Park, Chan-Ho;Ahn, Byeong-Il;Jeon, Do-Young
    • 제어로봇시스템학회:학술대회논문집
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    • pp.111.6-111
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    • 2001
  • A seat suspension system with a controlled MR(Magneto Rheological) fluid damper is introduced to improve the ride quality and prevent the health risk of a driver compared to conventional seats. The system locates between a seat cushion and base, and is composed of a spring, MR fluid damper and controller. The MR fluid damper designed in valve mode is capable of producing a wide range of damping force according to applied currents. In experiments, a person was sitting on the controlled seat excited by a hydraulic system. The skyhook control, continuous skyhook control and relative displacement control were applied and the continuous skyhook control improved the vibration suppression by 36.6%.

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Performance Evaluation of a Mixed-Mode Type ER Engine Mount(II)-Performance Evaluation Via HILS- (복합 모드형 ER엔진마운트의 성능평가 (II) - HILL를 통한 성능 평가 -)

  • Choe, Yeong-Tae;Choe, Seung-Bok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.9
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    • pp.2151-2158
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    • 2000
  • This paper presents vibration control performance of a passenger vehicle installed with the mixed-mode type ER engine mounts. The performance is evaluated via hardware-in-the-loop-simulation(HILS) method. As a first step, a dynamic model of a vehicle featuring the ER engine mounts is formulated by taking into account the engine excitation forces. A new type of the fuzzy skyhook controller is then established in order to control both engine and body vibrations. This is accomplished by adopting a weighting parameter between two performance criteria which is to be determined from the fuzzy algorithm. Vertical displacement and acceleration of the engine mount obtained from the HILS method are provided in the frequency domain. In addition, vibration control performance between the conventional hydraulic engine mount and the proposed engine mount is compared in the time and frequency domains.

Development of the Semi-Active Controlled Variable Damper System for Passenger Vehicles (승용차용 반능동형 가변댐퍼 시스템의 개발)

  • 허승진;심정수;황성호
    • Journal of KSNVE
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    • v.8 no.4
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    • pp.683-689
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    • 1998
  • A control algorithm for multi-stage dampers is developed based on the mode skyhook control concept, and implemented on the full vehicle system environment. The test vehicle system is equipped with the real time controller, four-stage variable dampers and sensors. The real time controller is developed using a digital signal processor(DSP), digital I/O, A/D and D/A converters. The dampers are driven by the electromagnetic actuators of less than 20 msec response time. The sensors include accelerometers, relative displacement transducers, and steering wheel rate sensors, etc. Through a series of tests in laboratory and proving ground, the performance of the semi-active suspension system is evaluated and it is shown that the vehicle dynamic characteristics is improved with the developed damping system. Futhermore, the parameter tuning methods to enhance vehicle dynamic performance are propsoed.

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Development of the semi-active controlled variable damper system for passenger vehicles (승용차용 반능동형 가변댐퍼시스템의 개발)

  • 허승진;심정수;이광기;김홍석;황성호
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.45-50
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    • 1995
  • 본 연구에서는 기존에 널리 사용되고 있는 스카이훅 제어 알고리즘(skyhook control algorithm)[3]을 바탕으로 확장 개발된 모드 스카이훅 제어(mode skyhook control) 개념 및 주파수 감응식 제어(frequency dependent control)개념[4][5]을 실용화하기 위하여 응답속도가 20msec이하의 비교적 빠른 응답 속도를 갖는 전자기식 작동기 (electro-magnetic actuator)에 의해 가변되는 4단 반능동형 가변 댐퍼 시스템을 개발한 후, 다음과 같은 성능의 향상을 시험결과를 통하여 보이고자 한다. -저속에서의 승차감 향상과 고속에서의 주행 안정성 향상 -커브 주행 또는 급격한 핸들 작동시의 롤안정성 (rolling stability) 향상 -제동 및 급발진시의 차체 피칭 운동 방지 (anti-dive, anti-squat)

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Vibration Control Performance of a Passenger Vehicle Featuring ER Engine Mounts (ER 엔진마운트를 장착한 승용차량의 진동제어 성능)

  • Song, Hyun-Jeong;Choi, Seung-Bok;Jeon, Young-Sik
    • Proceedings of the KSME Conference
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    • pp.481-486
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    • 2000
  • This paper presents vibration control performance of a passenger vehicle installed with olectro-rheological(ER) engine mounts. As a first step, a mixed-mode ER engine mount is modeled and manufactured. After verifying the controllability of the dynamic stiffness by the intensity of the electric field, ER engine mounts are incorporated with a full-car model. The governing equation of motion is then formulated by considering engine excitation force. A skyhook controller to attenuate vibration motions is designed. The controller is implemented through hardware-in-the-loop simulation and control responses are presented in the both frequency and time domains.

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Sliding Mode Control for an Intelligent Landing Gear Equipped with Magnetorheological Damper

  • Viet, Luong Quoc;Lee, Hyo-sang;Jang, Dae-sung;Hwang, Jai-hyuk
    • Journal of Aerospace System Engineering
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    • v.14 no.2
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    • pp.20-27
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    • 2020
  • Several uncertainties in the landing environment of an aircraft are not considered, such as the falling speed, ambient temperature, and sensor noise. These uncertainties negatively affect the performance of the controller applied to a landing gear. The sliding mode control (SMC) method, which maintains the optimal performance of a controller under uncertainties, is used in this study. The landing gear is equipped with a magnetorheological damper that changes the yield shear stress according to the applied magnetic field. The applied controller employs a hybrid control combining Skyhook control and force control. The SMC maintains the optimal performance of the hybrid control by minimizing the tracking error of the damper force, even in various landing environments where parameter uncertainties are applied. The effect of SMC is verified through co-simulation results from Simscape and Simulink.